San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
Are Rats Able to Enter a Property Through the Plumbing?
Rats are able to swim:
Rats are surprisingly flexible and they have some excellent swimming abilities. Even if they have to make their way in through your pipes, it won't take long for them to make their way into your home if they are located under it in the groundwater. A rat is a perfect size to get through most water pipes or sewage pipes and this can mean easy access into your home.
There are dry spots throughout your plumbing:
Depending on the way your plumbing bends, it is likely that there could be some dry spots within your plumbing or within the inner workings of your home. Rats may enter into your plumbing and may even build nests throughout these dryer areas.
Rats can damage your plumbing:
As well as being able to scurry through your plumbing, rats could potentially damage your plumbing or even clog up your pipes. If there is a major rat problem or a nest nearby, you could be risking the chance that you could damage your neighbor's pipes or have an ongoing rat problem in your own home.
Rats easily enter in through broken lines:
If there are areas of your plumbing that have fallen into disrepair, make sure that they can be properly fixed up. Broken sewer lines or tree roots in your plumbing can often be the perfect place for many rats to make their way into your property.
Check grates and drain covers:
Installing mesh or making sure that you have a proper cover for your drain covers can be important to keeping rats from invading your space. Regularly looking at all of your drains and making sure that a rat can't make their way inside can be very important.
Close your toilet lid:
Closing a toilet lid could be a simple practice you could use that can stop rats from entering your home.
